/**
 * @file
 * Sockets stresstest
 *
 * This file uses the lwIP socket API to do stress tests that should test the
 * stability when used in many different situations, with many concurrent
 * sockets making concurrent transfers in different manners.
 *
 * - test rely on loopback sockets for now, so netif drivers are not tested
 * - all enabled functions shall be used
 * - parallelism of the tests depend on enough resources being available
 *   (configure your lwipopts.h settings high enough)
 * - test should also be able to run in a real target
 *
 * TODO:
 * - full duplex
 * - add asserts about internal socket/netconn/pcb state?
 */

/*
* Copyright (c) 2017 Simon Goldschmidt
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
*    this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
*    this list of conditions and the following disclaimer in the documentation
*    and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Simon Goldschmidt <goldsimon@gmx.de>
*
*/

#include "lwip/opt.h"
#include "sockets_stresstest.h"

#include "lwip/sockets.h"
#include "lwip/sys.h"

#include "lwip/mem.h"

#include <stdio.h>
#include <string.h>

#if LWIP_SOCKET && LWIP_IPV4 /* this uses IPv4 loopback sockets, currently */

#ifndef TEST_SOCKETS_STRESS
#define TEST_SOCKETS_STRESS LWIP_DBG_OFF
#endif

#define TEST_TIME_SECONDS    10
#define TEST_TXRX_BUFSIZE    (TCP_MSS * 2)
#define TEST_MAX_RXWAIT_MS   50
#define TEST_MAX_CONNECTIONS 50

#define TEST_SOCK_READABLE 0x01
#define TEST_SOCK_WRITABLE 0x02
#define TEST_SOCK_ERR      0x04

#define TEST_MODE_SELECT      0x01
#define TEST_MODE_POLL        0x02
#define TEST_MODE_NONBLOCKING 0x04
#define TEST_MODE_WAIT        0x08
#define TEST_MODE_RECVTIMEO   0x10
#define TEST_MODE_SLEEP       0x20

static int sockets_stresstest_numthreads;

struct test_settings {
    struct sockaddr_storage addr;
    int start_client;
    int loop_cnt;
};

struct sockets_stresstest_fullduplex {
    int s;
    volatile int closed;
};

static void fill_test_data(void *buf, size_t buf_len_bytes)
{
    u8_t *p = (u8_t *)buf;
    u16_t i, chk;

    LWIP_ASSERT("buffer too short", buf_len_bytes >= 4);
    LWIP_ASSERT("buffer too big", buf_len_bytes <= 0xFFFF);
    /* store the total number of bytes */
    p[0] = (u8_t)(buf_len_bytes >> 8);
    p[1] = (u8_t)buf_len_bytes;

    /* fill buffer with random */
    chk = 0;

    for (i = 4; i < buf_len_bytes; i++) {
        u8_t rnd = (u8_t)LWIP_RAND();
        p[i] = rnd;
        chk += rnd;
    }

    /* store checksum */
    p[2] = (u8_t)(chk >> 8);
    p[3] = (u8_t)chk;
}

static size_t check_test_data(const void *buf, size_t buf_len_bytes)
{
    u8_t *p = (u8_t *)buf;
    u16_t i, chk, chk_rx, len_rx;

    LWIP_ASSERT("buffer too short", buf_len_bytes >= 4);
    len_rx = (((u16_t)p[0]) << 8) | p[1];
    LWIP_ASSERT("len too short", len_rx >= 4);

    if (len_rx > buf_len_bytes) {
        /* not all data received in this segment */
        LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_TRACE, ("check-\n"));
        return buf_len_bytes;
    }

    chk_rx = (((u16_t)p[2]) << 8) | p[3];
    /* calculate received checksum */
    chk = 0;

    for (i = 4; i < len_rx; i++) {
        chk += p[i];
    }

    LWIP_ASSERT("invalid checksum", chk == chk_rx);

    if (len_rx < buf_len_bytes) {
        size_t data_left = buf_len_bytes - len_rx;
        memmove(p, &p[len_rx], data_left);
        return data_left;
    }

    /* if we come here, we received exactly one chunk
       -> next offset is 0 */
    return 0;
}

static size_t recv_and_check_data_return_offset(int s, char *rxbuf, size_t rxbufsize, size_t rxoff, int *closed, const char *dbg)
{
    ssize_t ret;

    ret = lwip_read(s, &rxbuf[rxoff], rxbufsize - rxoff);

    if (ret == 0) {
        *closed = 1;
        return rxoff;
    }

    *closed = 0;
    LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_TRACE, ("%s %d rx %d\n", dbg, s, (int)ret));

    if (ret == -1) {
        /* TODO: for this to work, 'errno' has to support multithreading... */
        int err = errno;

        if (err == ENOTCONN) {
            *closed = 1;
            return 0;
        }

        LWIP_ASSERT("err == 0", err == 0);
    }

    LWIP_ASSERT("ret > 0", ret > 0);
    return check_test_data(rxbuf, rxoff + ret);
}

#if LWIP_SOCKET_SELECT
static int sockets_stresstest_wait_readable_select(int s, int timeout_ms)
{
    int ret;
    struct timeval tv;
    fd_set fs_r;
    fd_set fs_w;
    fd_set fs_e;

    FD_ZERO(&fs_r);
    FD_ZERO(&fs_w);
    FD_ZERO(&fs_e);

    FD_SET(s, &fs_r);
    FD_SET(s, &fs_e);

    tv.tv_sec = timeout_ms / 1000;
    tv.tv_usec = (timeout_ms - (tv.tv_sec * 1000)) * 1000;
    ret = lwip_select(s + 1, &fs_r, &fs_w, &fs_e, &tv);
    LWIP_ASSERT("select error", ret >= 0);

    if (ret) {
        /* convert poll flags to our flags */
        ret = 0;

        if (FD_ISSET(s, &fs_r)) {
            ret |= TEST_SOCK_READABLE;
        }

        if (FD_ISSET(s, &fs_w)) {
            ret |= TEST_SOCK_WRITABLE;
        }

        if (FD_ISSET(s, &fs_e)) {
            ret |= TEST_SOCK_ERR;
        }

        return ret;
    }

    return 0;
}
#endif

#if LWIP_SOCKET_POLL
static int sockets_stresstest_wait_readable_poll(int s, int timeout_ms)
{
    int ret;
    struct pollfd pfd;

    pfd.fd = s;
    pfd.revents = 0;
    pfd.events = POLLIN | POLLERR;

    ret = lwip_poll(&pfd, 1, timeout_ms);

    if (ret) {
        /* convert poll flags to our flags */
        ret = 0;

        if (pfd.revents & POLLIN) {
            ret |= TEST_SOCK_READABLE;
        }

        if (pfd.revents & POLLOUT) {
            ret |= TEST_SOCK_WRITABLE;
        }

        if (pfd.revents & POLLERR) {
            ret |= TEST_SOCK_ERR;
        }

        return ret;
    }

    return 0;
}
#endif

#if LWIP_SO_RCVTIMEO
static int sockets_stresstest_wait_readable_recvtimeo(int s, int timeout_ms)
{
    int ret;
    char buf;
#if LWIP_SO_SNDRCVTIMEO_NONSTANDARD
    int opt_on = timeout_ms;
    int opt_off = 0;
#else
    struct timeval opt_on, opt_off;
    opt_on.tv_sec = timeout_ms / 1000;
    opt_on.tv_usec = (timeout_ms - (opt_on.tv_sec * 1000)) * 1000;
    opt_off.tv_sec = 0;
    opt_off.tv_usec = 0;
#endif

    /* enable receive timeout */
    ret = lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &opt_on, sizeof(opt_on));
    LWIP_ASSERT("setsockopt error", ret == 0);

    /* peek for one byte with timeout */
    ret = lwip_recv(s, &buf, 1, MSG_PEEK);

    /* disable receive timeout */
    ret = lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &opt_off, sizeof(opt_off));
    LWIP_ASSERT("setsockopt error", ret == 0);

    if (ret == 1) {
        return TEST_SOCK_READABLE;
    }

    if (ret == 0) {
        return 0;
    }

    if (ret == -1) {
        return TEST_SOCK_ERR;
    }

    LWIP_ASSERT("invalid return value", 0);
    return TEST_SOCK_ERR;
}
#endif

static int sockets_stresstest_wait_readable_wait_peek(int s, int timeout_ms)
{
    int ret;
    char buf;

    LWIP_UNUSED_ARG(timeout_ms); /* cannot time out here */

    /* peek for one byte */
    ret = lwip_recv(s, &buf, 1, MSG_PEEK);

    if (ret == 1) {
        return TEST_SOCK_READABLE;
    }

    if (ret == 0) {
        return 0;
    }

    if (ret == -1) {
        return TEST_SOCK_ERR;
    }

    LWIP_ASSERT("invalid return value", 0);
    return TEST_SOCK_ERR;
}

static int sockets_stresstest_wait_readable_nonblock(int s, int timeout_ms)
{
    int ret;
    char buf;
    u32_t wait_until = sys_now() + timeout_ms;

    while (sys_now() < wait_until) {
        /* peek for one byte */
        ret = lwip_recv(s, &buf, 1, MSG_PEEK | MSG_DONTWAIT);

        if (ret == 1) {
            return TEST_SOCK_READABLE;
        }

        if (ret == -1) {
            /* TODO: for this to work, 'errno' has to support multithreading... */
            int err = errno;

            if (err != EWOULDBLOCK) {
                return TEST_SOCK_ERR;
            }
        }

        /* TODO: sleep? */
    }

    return 0;
}

static int sockets_stresstest_rand_mode(int allow_wait, int allow_rx)
{
    u32_t random_value = LWIP_RAND();
#if LWIP_SOCKET_SELECT

    if (random_value & TEST_MODE_SELECT) {
        return TEST_MODE_SELECT;
    }

#endif
#if LWIP_SOCKET_POLL

    if (random_value & TEST_MODE_POLL) {
        return TEST_MODE_POLL;
    }

#endif

    if (!allow_rx) {
        return TEST_MODE_SLEEP;
    }

#if LWIP_SO_RCVTIMEO

    if (random_value & TEST_MODE_RECVTIMEO) {
        return TEST_MODE_RECVTIMEO;
    }

#endif

    if (allow_wait) {
        if (random_value & TEST_MODE_RECVTIMEO) {
            return TEST_MODE_RECVTIMEO;
        }
    }

    return TEST_MODE_NONBLOCKING;
}

static int sockets_stresstest_wait_readable(int mode, int s, int timeout_ms)
{
    switch (mode) {
#if LWIP_SOCKET_SELECT

        case TEST_MODE_SELECT:
            return sockets_stresstest_wait_readable_select(s, timeout_ms);
#endif
#if LWIP_SOCKET_POLL

        case TEST_MODE_POLL:
            return sockets_stresstest_wait_readable_poll(s, timeout_ms);
#endif
#if LWIP_SO_RCVTIMEO

        case TEST_MODE_RECVTIMEO:
            return sockets_stresstest_wait_readable_recvtimeo(s, timeout_ms);
#endif

        case TEST_MODE_WAIT:
            return sockets_stresstest_wait_readable_wait_peek(s, timeout_ms);

        case TEST_MODE_NONBLOCKING:
            return sockets_stresstest_wait_readable_nonblock(s, timeout_ms);

        case TEST_MODE_SLEEP: {
            sys_msleep(timeout_ms);
            return 1;
        }

        default:
            LWIP_ASSERT("invalid mode", 0);
            break;
    }

    return 0;
}

#if LWIP_NETCONN_FULLDUPLEX
static void sockets_stresstest_conn_client_r(void *arg)
{
    struct sockets_stresstest_fullduplex *fd = (struct sockets_stresstest_fullduplex *)arg;
    int s = fd->s;
    size_t rxoff = 0;
    char rxbuf[TEST_TXRX_BUFSIZE];

    while (1) {
        int closed;

        if (fd->closed) {
            break;
        }

        rxoff = recv_and_check_data_return_offset(s, rxbuf, sizeof(rxbuf), rxoff, &closed, "cli");

        if (fd->closed) {
            break;
        }

        if (closed) {
            lwip_close(s);
            break;
        }
    }

    SYS_ARCH_DEC(sockets_stresstest_numthreads, 1);
    LWIP_ASSERT("", sockets_stresstest_numthreads >= 0);
}
#endif

static void sockets_stresstest_conn_client(void *arg)
{
    struct sockaddr_storage addr;
    struct sockaddr_in *addr_in;
    int s, ret;
    char txbuf[TEST_TXRX_BUFSIZE];
    char rxbuf[TEST_TXRX_BUFSIZE];
    size_t rxoff = 0;
    u32_t max_time = sys_now() + (TEST_TIME_SECONDS * 1000);
    int do_rx = 1;
    struct sockets_stresstest_fullduplex *data = NULL;

    memcpy(&addr, arg, sizeof(addr));
    LWIP_ASSERT("", addr.ss_family == AF_INET);
    addr_in = (struct sockaddr_in *)&addr;
    addr_in->sin_addr.s_addr = inet_addr("127.0.0.1");

    /* sleep a random time between 1 and 2 seconds */
    sys_msleep(1000 + (LWIP_RAND() % 1000));

    /* connect to the server */
    s = lwip_socket(addr.ss_family, SOCK_STREAM, 0);
    LWIP_ASSERT("s >= 0", s >= 0);

#if LWIP_NETCONN_FULLDUPLEX

    if (LWIP_RAND() & 1) {
        sys_thread_t t;
        data = (struct sockets_stresstest_fullduplex *)mem_malloc(sizeof(struct sockets_stresstest_fullduplex));
        LWIP_ASSERT("data != NULL", data != 0);
        SYS_ARCH_INC(sockets_stresstest_numthreads, 1);
        data->s = s;
        data->closed = 0;
        t = sys_thread_new("sockets_stresstest_conn_client_r", sockets_stresstest_conn_client_r, data, 0, 0);
        LWIP_ASSERT("thread != NULL", t != 0);
        do_rx = 0;
    }

#endif

    /* @todo: nonblocking connect? */
    ret = lwip_connect(s, (struct sockaddr *)&addr, sizeof(struct sockaddr_storage));
    LWIP_ASSERT("ret == 0", ret == 0);

    while (sys_now() < max_time) {
        int closed;
        int mode = sockets_stresstest_rand_mode(0, do_rx);
        int timeout_ms = LWIP_RAND() % TEST_MAX_RXWAIT_MS;
        ret = sockets_stresstest_wait_readable(mode, s, timeout_ms);

        if (ret) {
            if (do_rx) {
                /* read some */
                LWIP_ASSERT("readable", ret == TEST_SOCK_READABLE);
                rxoff = recv_and_check_data_return_offset(s, rxbuf, sizeof(rxbuf), rxoff, &closed, "cli");
                LWIP_ASSERT("client got closed", !closed);
            }
        } else {
            /* timeout, send some */
            size_t send_len = (LWIP_RAND() % (sizeof(txbuf) - 4)) + 4;
            fill_test_data(txbuf, send_len);
            LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_TRACE, ("cli %d tx %d\n", s, (int)send_len));
            ret = lwip_write(s, txbuf, send_len);

            if (ret == -1) {
                /* TODO: for this to work, 'errno' has to support multithreading... */
                int err = errno;
                LWIP_ASSERT("err == 0", err == 0);
            }

            LWIP_ASSERT("ret == send_len", ret == (int)send_len);
        }
    }

    if (data) {
        data->closed = 1;
    }

    ret = lwip_close(s);
    LWIP_ASSERT("ret == 0", ret == 0);

    SYS_ARCH_DEC(sockets_stresstest_numthreads, 1);
    LWIP_ASSERT("", sockets_stresstest_numthreads >= 0);
}

static void sockets_stresstest_conn_server(void *arg)
{
    int s, ret;
    char txbuf[TEST_TXRX_BUFSIZE];
    char rxbuf[TEST_TXRX_BUFSIZE];
    size_t rxoff = 0;

    s = (int)arg;

    while (1) {
        int closed;
        int mode = sockets_stresstest_rand_mode(1, 1);
        int timeout_ms = LWIP_RAND() % TEST_MAX_RXWAIT_MS;
        ret = sockets_stresstest_wait_readable(mode, s, timeout_ms);

        if (ret) {
            if (ret & TEST_SOCK_ERR) {
                /* closed? */
                break;
            }

            /* read some */
            LWIP_ASSERT("readable", ret == TEST_SOCK_READABLE);
            rxoff = recv_and_check_data_return_offset(s, rxbuf, sizeof(rxbuf), rxoff, &closed, "srv");

            if (closed) {
                break;
            }
        } else {
            /* timeout, send some */
            size_t send_len = (LWIP_RAND() % (sizeof(txbuf) - 4)) + 4;
            fill_test_data(txbuf, send_len);
            LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_TRACE, ("srv %d tx %d\n", s, (int)send_len));
            ret = lwip_write(s, txbuf, send_len);

            if (ret == -1) {
                /* TODO: for this to work, 'errno' has to support multithreading... */
                int err = errno;

                if (err == ECONNRESET) {
                    break;
                }

                if (err == ENOTCONN) {
                    break;
                }

                LWIP_ASSERT("unknown error", 0);
            }

            LWIP_ASSERT("ret == send_len", ret == (int)send_len);
        }
    }

    ret = lwip_close(s);
    LWIP_ASSERT("ret == 0", ret == 0);

    SYS_ARCH_DEC(sockets_stresstest_numthreads, 1);
    LWIP_ASSERT("", sockets_stresstest_numthreads >= 0);
}

static int sockets_stresstest_start_clients(const struct sockaddr_storage *remote_addr)
{
    /* limit the number of connections */
    const int max_connections = LWIP_MIN(TEST_MAX_CONNECTIONS, MEMP_NUM_TCP_PCB / 3);
    int i;

    for (i = 0; i < max_connections; i++) {
        sys_thread_t t;
        SYS_ARCH_INC(sockets_stresstest_numthreads, 1);
        t = sys_thread_new("sockets_stresstest_conn_client", sockets_stresstest_conn_client, (void *)remote_addr, 0, 0);
        LWIP_ASSERT("thread != NULL", t != 0);
    }

    return max_connections;
}

static void sockets_stresstest_listener(void *arg)
{
    int slisten;
    int ret;
    struct sockaddr_storage addr;
    socklen_t addr_len;
    struct test_settings *settings = (struct test_settings *)arg;
    int num_clients, num_servers = 0;

    slisten = lwip_socket(AF_INET, SOCK_STREAM, 0);
    LWIP_ASSERT("slisten >= 0", slisten >= 0);

    memcpy(&addr, &settings->addr, sizeof(struct sockaddr_storage));
    ret = lwip_bind(slisten, (struct sockaddr *)&addr, sizeof(addr));
    LWIP_ASSERT("ret == 0", ret == 0);

    ret = lwip_listen(slisten, 0);
    LWIP_ASSERT("ret == 0", ret == 0);

    addr_len = sizeof(addr);
    ret = lwip_getsockname(slisten, (struct sockaddr *)&addr, &addr_len);
    LWIP_ASSERT("ret == 0", ret == 0);

    num_clients = sockets_stresstest_start_clients(&addr);

    while (num_servers < num_clients) {
        struct sockaddr_storage aclient;
        socklen_t aclient_len = sizeof(aclient);
        int sclient = lwip_accept(slisten, (struct sockaddr *)&aclient, &aclient_len);
#if 1
        /* using server threads */
        {
            sys_thread_t t;
            SYS_ARCH_INC(sockets_stresstest_numthreads, 1);
            num_servers++;
            t = sys_thread_new("sockets_stresstest_conn_server", sockets_stresstest_conn_server, (void *)sclient, 0, 0);
            LWIP_ASSERT("thread != NULL", t != 0);
        }
#else
        /* using server select */
#endif
    }

    LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_STATE, ("sockets_stresstest_listener: all %d connections established\n", num_clients));

    /* accepted all clients */
    while (sockets_stresstest_numthreads > 0) {
        sys_msleep(1);
    }

    ret = lwip_close(slisten);
    LWIP_ASSERT("ret == 0", ret == 0);

    LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_STATE, ("sockets_stresstest_listener: done\n"));
}

static void sockets_stresstest_listener_loop(void *arg)
{
    int i;
    struct test_settings *settings = (struct test_settings *)arg;

    if (settings->loop_cnt) {
        for (i = 0; i < settings->loop_cnt; i++) {
            LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_STATE, ("sockets_stresstest_listener_loop: iteration %d\n", i));
            sockets_stresstest_listener(arg);
            sys_msleep(2);
        }

        LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_STATE, ("sockets_stresstest_listener_loop: done\n"));
    } else {
        for (i = 0;; i++) {
            LWIP_DEBUGF(TEST_SOCKETS_STRESS | LWIP_DBG_STATE, ("sockets_stresstest_listener_loop: iteration %d\n", i));
            sockets_stresstest_listener(arg);
            sys_msleep(2);
        }
    }
}

void sockets_stresstest_init_loopback(int addr_family)
{
    sys_thread_t t;
    struct test_settings *settings = (struct test_settings *)mem_malloc(sizeof(struct test_settings));

    LWIP_ASSERT("OOM", settings != NULL);
    memset(settings, 0, sizeof(struct test_settings));
#if LWIP_IPV4 && LWIP_IPV6
    LWIP_ASSERT("invalid addr_family", (addr_family == AF_INET) || (addr_family == AF_INET6));
#endif
    settings->addr.ss_family = (sa_family_t)addr_family;
    LWIP_UNUSED_ARG(addr_family);
    settings->start_client = 1;

    t = sys_thread_new("sockets_stresstest_listener_loop", sockets_stresstest_listener_loop, settings, 0, 0);
    LWIP_ASSERT("thread != NULL", t != 0);
}

void sockets_stresstest_init_server(int addr_family, u16_t server_port)
{
    sys_thread_t t;
    struct test_settings *settings = (struct test_settings *)mem_malloc(sizeof(struct test_settings));

    LWIP_ASSERT("OOM", settings != NULL);
    memset(settings, 0, sizeof(struct test_settings));
#if LWIP_IPV4 && LWIP_IPV6
    LWIP_ASSERT("invalid addr_family", (addr_family == AF_INET) || (addr_family == AF_INET6));
    settings->addr.ss_family = (sa_family_t)addr_family;
#endif
    LWIP_UNUSED_ARG(addr_family);
    ((struct sockaddr_in *)(&settings->addr))->sin_port = server_port;

    t = sys_thread_new("sockets_stresstest_listener", sockets_stresstest_listener, settings, 0, 0);
    LWIP_ASSERT("thread != NULL", t != 0);
}

void sockets_stresstest_init_client(const char *remote_ip, u16_t remote_port)
{
#if LWIP_IPV4
    ip4_addr_t ip4;
#endif
#if LWIP_IPV6
    ip6_addr_t ip6;
#endif
    struct sockaddr_storage *addr = (struct sockaddr_storage *)mem_malloc(sizeof(struct sockaddr_storage));

    LWIP_ASSERT("OOM", addr != NULL);
    memset(addr, 0, sizeof(struct test_settings));
#if LWIP_IPV4

    if (ip4addr_aton(remote_ip, &ip4)) {
        addr->ss_family = AF_INET;
        ((struct sockaddr_in *)addr)->sin_addr.s_addr = ip4_addr_get_u32(&ip4);
    }
#endif
#if LWIP_IPV4 && LWIP_IPV6
    else
#endif
#if LWIP_IPV6
        if (ip6addr_aton(remote_ip, &ip6)) {
        addr->ss_family = AF_INET6;
        /* todo: copy ipv6 address */
    }

#endif
    ((struct sockaddr_in *)addr)->sin_port = remote_port;
    sockets_stresstest_start_clients(addr);
}

#endif /* LWIP_SOCKET && LWIP_IPV4 */
